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  1. County of Northumberland

  2. Northumberland County, Pennsylvania - Wikipedia

  3. Northumberland, Pennsylvania - Wikipedia

  4. History of Northumberland CountyCounty of Northumberland

  5. Area History | Northumberland County Historical Society

  6. Northumberland County, Pennsylvania Genealogy - FamilySearch

  7. Northumberland County Historical Society

  8. Northumberland County, Pennsylvania - Simple English Wikipedia

  9. Northumberland, Pennsylvania - Susquehanna River

  10. Northumberland County, Pennsylvania - Wikiwand